Improved preparation of cellulose spinning solution with ion liquid as solvent

Abstract

The invention provides a method for preparing an improved fibrino spinning original solution that ion liquid is used as solvent, which includes: two phases of swelling and dissolution, namely, placing dried fibrino dissolving pulp and 1-butyl-3-methyl imidazole villaumite with 1%-20% water ratio into a dissolution device for uniform mixing, firstly, leaving and swelling in 70-100 DEG. C, then stronger stirring for swelling to plasm shape without dissolution; secondly, raising temperature to 80-125 DEG. C slowly in stirring state, stirring and reducing pressure distillation for removing water component, fibrino can be dissolved completely after 2-8h; finally, reducing stirring speed, and reducing temperature of plasm to 90-100 DEG. C and keeping 30-60 min for obtaining straw yellow spinning original solution. The method provided by the invention has advantages that the spinning original solution is more uniform, dissolution is more fully, gelatin particle in the spinning original solution is reduced, the spinning original solution quality is increased; apparent viscosity of the spinning original solution is reduced, accordingly, solid content in the spinning original solution is increased further.

Description

technical field [0001] The invention belongs to the field of preparation of cellulose spinning stock solution, in particular to an improved preparation method of cellulose spinning stock solution using ionic liquid as a solvent. Background technique [0002] Cellulose is the most abundant natural polymer resource on the earth, and a large amount of cellulose can be produced in nature through green photosynthesis every year. Due to the rich source of cellulose raw materials, and the waste of cellulose products can be degraded naturally, or decomposed into carbon dioxide and water by enzymes. Therefore, in today's increasingly scarce petroleum resources, the production and processing of cellulose as a raw material has attracted much attention. And cellulose fiber and its fiber products are more and more subject to people's favor because of having excellent water absorption, moisture permeability and good wearing comfort. The traditional cellulose fiber is mainly produced by ...

AI Technical Summary

Problems solved by technology

However, we used a polarizing microscope to track the dissolution process of cellulose and found that: due to the strong dissolving ability of pure ionic liquid to cellulose, during the dissolution process, part of the cellulose in contact with the ionic liquid dissolves quickly, thus forming a dissolved The undissolved cellulose is covered by the cellulose slurry, so that the inner layer of cellulose cannot be completely dissolved, so there is uneven dissolution, gel particles are formed in the spinning solution, and eventually the number of broken ends in the spinning process increases, and the spinning Unstable silk status and serious waste

In addition, the apparent viscosity of the spinning dope prepared by this direct dissolution method is relatively high, which limits the solid content of the spinning dope and reduces production efficiency.